Many a Roman assumed this (4)

I believe the answer is:

toga

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'roman assumed this' is the definition.
The definition suggests a singular noun which matches the answer.

'many a' is the wordplay.
'many' becomes 'tog' (I can't explain this - if you can you should believe this answer much more).
'tog'+'a'='TOGA'

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(Other definitions for toga that I've seen before include "Outer garment" , "Robe for an ancient Roman" , "Got a robe for an old Roman" , "draped cloth" , "Robe of ancient Rome" .)

I've seen this clue in The Irish News.

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